The gear selector of an automatic transmission is typically located on the center console or steering column of a vehicle. It allows the driver to choose between different driving modes such as Park, Reverse, Neutral, Drive, and sometimes additional modes like Sport or Low. The gear selector is usually a lever that can be moved between these different positions to control the transmission's gear selection. When the driver shifts into a particular gear, the transmission automatically engages the appropriate gear ratio based on the driving conditions. **

The gear selector of an automatic car is typically located on the center console or steering column. It consists of a lever with different positions such as Park (P), Reverse (R), Neutral (N), and Drive (D). To operate the gear selector, the driver simply needs to move the lever to the desired position. Some automatic cars also have additional settings such as Sport mode or manual shifting options. **

There are several potential reasons why your automatic transmission may not engage when you put the gear selector in Drive. It could be due to low transmission fluid levels, a faulty transmission solenoid, a malfunctioning torque converter, or a problem with the transmission control module. It's important to have your vehicle inspected by a qualified mechanic to diagnose and address the issue promptly to avoid further damage to the transmission. **

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No, it is not possible to convert a 7-speed gear system to a 21-speed gear system. The number of speeds in a gear system is determined by the number of sprockets on the rear wheel and the number of chainrings on the front crankset. A 7-speed system has 7 sprockets on the rear wheel and one or two chainrings on the front crankset, while a 21-speed system has 7 sprockets on the rear wheel and 3 chainrings on the front crankset. Therefore, to convert a 7-speed system to a 21-speed system, you would need to replace the entire drivetrain, including the rear wheel, front crankset, shifters, and derailleurs. **

The Shimano 7-speed gear shift may crack in every gear due to a few potential reasons. One possible cause could be that the gear shift is not properly adjusted, leading to misalignment and causing the cracking sound. Another reason could be wear and tear on the gear shift components, such as the cables or the shifter itself, which can lead to issues with smooth gear changes. Additionally, the gear shift may crack in every gear if there is dirt or debris built up in the gear mechanism, causing friction and noise during shifting. Regular maintenance and proper adjustment can help address these issues and prevent the gear shift from cracking in every gear. **

It is not recommended to use fifth gear when driving uphill, as it may strain the engine and cause it to work harder than necessary. It is better to downshift to a lower gear, such as third or fourth, to maintain a steady speed and prevent the engine from overworking. This will also provide better control and power when driving uphill. **

From 5th gear, the next gear in most manual transmission vehicles is 6th gear. However, some vehicles may have additional gears beyond 6th, such as 7th or 8th gear. The higher gears are typically used for cruising at high speeds on highways to improve fuel efficiency and reduce engine strain. **